Created
April 15, 2015 03:14
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Encapsulate iOS background tasks in a Swift class
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class BackgroundTask { | |
private let application: UIApplication | |
private var identifier = UIBackgroundTaskInvalid | |
init(application: UIApplication) { | |
self.application = application | |
} | |
class func run(application: UIApplication, handler: (BackgroundTask) -> ()) { | |
// NOTE: The handler must call end() when it is done | |
let backgroundTask = BackgroundTask(application: application) | |
backgroundTask.begin() | |
handler(backgroundTask) | |
} | |
func begin() { | |
self.identifier = application.beginBackgroundTaskWithExpirationHandler { | |
self.end() | |
} | |
} | |
func end() { | |
if (identifier != UIBackgroundTaskInvalid) { | |
application.endBackgroundTask(identifier) | |
} | |
identifier = UIBackgroundTaskInvalid | |
} | |
} |
When I try to apply over code in my project but it not work? Can you help me? What should do when I try reconnect socket during Foreground app long time?
If begin
is not part of the public API (i.e. the caller who supplies the handler will never call it), it should be private
.
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This is correct. Please don't confuse it with an async block of code that you would run on a Dispatch background queue. BackgroundTask's job is just to tell UIKit that the code (task) was ran, i.e. the background task finished. Usually you would use this in the application delegate function: